This paper represents the work of several years of observation of
CTA 102 with both single dish telescopes and interferometric
arrays, covering wavelengths from 1.2 cm to 1.3 mm.
The resolution of the maps covers an order of magnitude from
0.5 mas to 50 μas. The images presented demonstrate the rapid structural
changes in this source. These rapid structural changes correlates with
the outbursts seen in the total flux, turnover frequency and in the
spectral index. We have calculated the Brightness Temperatures of the
components (TB) directly from the determined component
sizes and also using the logarithmic variability amplitudes and
timescales to calculate the s. Both the methods
yielded measurements of source frame TBs no higher than ~a
K.
We find that the observed average proper motion is
~ mas/yr, which corresponds to an apparent transverse
velocity of c.

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